Grinding-mill or crusher.



C. GOLTDAMMER.

GRINDING MILL 0R CRUSHER.

APPLICATION HLED JULY 31.1915.

Patented June 6, 1916. l I

C. GOLTDAMMER.

GRINDING MILL 0R CRUSHER.

APPLICATION FILED IuLYaI. I9I5.

1,186,476. Patented June 6, 1916.

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C. GOLTDAMMER.

GRINDING MILL 0R CRUSHER.

PP'ucATloN FILED JULY s1 19| A l 5: 1 ,186,476. Patented June 6, 1916.

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CUR'I GOLTDAMMER, 0F KATTOWIIZ, GERMANY.

GRINDING-MILL 0R CRUSHER.

Application led J'uly 31, 1915.`

To all whom t may concern:

Be it known that I, CUnT GOLTDAMMER, subject of the King of Prussia, residing at Kattowitz, Province of Silesia, Germany, have invented certain new. and uesful Improvements in GrindingdWIills or Crushers, of which the following is a specification.

My invention relates to grinding mills or Crushers used for reducing hard materials such as ore, cement vor the' like toa coarse powder or to dust.

The invention relates more especially to that type of mills or Crushers in which three or more steel rollers are encircled by a steel ring coperating with the rollers in the reduction of the material introduced between them. In mills of this kind the steel ring is usually carried and caused to rotate by the uppermost roller, while the lower rollers are pressed against the inner surface of the ring by springsV exerting an outward ull `upon them. The rollers being encircle by the ring can not easily be laid open or removed for inspection and repairs. 'In Aorde'i` to obviate this inconvenience, according to my invention the bearings of all the rolls are located in two separate frames placed on both sides of, but entirely separated from the mill proper and the casing lsurrounding same.

The mill proper is not in anyway con-l nected with the means for carrying the roll axles and it is possible therefore tolay the mill openby simply removing the casing. In order to facilitate this removal the casing is divided vertically,the two halves of the casing being adapted to be moved aside after the screws connecting them and fastening them to the base plate have been taken off, without necessitating the use of a lifting device.

In the drawings afxed to the specication the preferred form of a mill according to the present invention is shown.

Figure 1 is a side elevation, partly in section; Fig. 2 is a front elevation, partly in vertical cross-section; Fig. 3 is a cross section on the line 2-2 (Fig. 2), partly broken away, with the two halves of the casing pplled aside (Figs. 3a and 3b).

z is the base plate, a; a are'two framesor trusses carried by said plate and located at both sides of the mill proper. The axle b1 of the upper grinding roller w1 is carried in bearings p1 in the frames, said bearings being either stationary, as represented in the Specification of Letters Patent.

Patented J une 6, 1916.

Serial N o. 43,026. i

drawings, or movable against the action of suitable springs. The axles b2 b3 of the two lower rollers w2 w3 are carried in bearings p2 p3 suspended on the frames a .by aid of levers CZ pivoted to pins o located on the outer side of the frames. Connecting rods f connected with the axle bearings p2 p3 by knuckle joints y formed in extensions y' of levers Z are acted upon in a radial direction by' strong springs g inserted between seats t on the frames and twin plates w, w3 adapted to be adjusted on the connecting rods by aid of nuts w1, a ball and socket joint wik being inserted between the plates. By tightening the nuts w1 the degree of compression of the springs g may be varied, said compression corresponding to the radial pressure exerted by the rollers w1 w3 upon the ring Vr running freely upon the rollers w1 w2 w3 (Fig. 3). The rollers w2 w3 owing to their being suspended on the oscillating` levers Z and owing to the springs g `are free to follow all radial movements occurring while the mill is working. Such 'movements are further facilitated by the In order to prevent the material to be Y ground from passingv through the side openings inthe walls of the mill for the passage of the roller axles, dish-shaped disks la, are fastened to the rollers w1, wz, w3 by means of bolts lc, said disks being provided withoblique extending annular flanges k2.

`This arrangement is preferable to the use of v solid flanges in so far as the disks k1 do not come in contact with the grinding ring 1' nor with the Ahard material tol be ground, while the rollers are rotating. The disks cl also serve to prevent bigger pieces of iron sometimes admixed with the material to be ground from being jammed between the rollers and the side walls of the mill.

The driving pulley s is fixed on the axle b1 of roller w1. Ring r is carried along by the friction created between it and roller w1. The rollers and the ring r are inclosed in a casing i consisting of two halves l and 2 (Figs. 8a and 3b). The two halves of the casing are not in any way connected with the axles b1 b2 b3 nor with ring r either; in the working position they are fastened to the base plate e by screws Aml, and to each other by screws m2. The casing walls are provided with apertures 3 i4 5 G allowing l the axles b1 52 53 to pass through. Part z', of the casing carries the feed funnel 'I terminating in two channels S1 S2 feeding the material to be ground sidewise between the lower roller w3 and ring 7 at X. The ground material is removed from the mill through an aperture Q provided in the base plate Z.

If it is desired to remove the inner parts, the screws m1 m2 are loosened and the halves l 2 of the casing are withdrawn sidewise. Now the nuts u., are removed from the connection rods f and the covers from the bearings p2 and p3. The bearings themselves will fall off the axles by themselves, thus allowing the axles to be withdrawn sidewise through the aperture of the trusses a represented in Fig. l, together with the rollers co2 w3. If it is desired to remove the upper roller w1 and ring r also, this latter should be lifted somewhat, in order to allow the upper axle b, and roller w1 to be removed, after taking off the cover of bearing 51. Ring r being thus laid free may then be withdrawn between the trusses. Provided that the axle b1 of the upper roller is located in stationary bearings, as shown in the drawings7 a single pulley s will serve for driving the mill without causing the rollers to be pulled out of position by the one-sided pull exerted upon the aXle b1, as is usually the case in mills driven from a single pulley located sidewise, such pulling action causing the rollers to be worn out on one side more than on'the other side.

In the mill described above the casing merely serves its natural purpose of inclosing the grinding ring and rollers and of thusI preventing dust from being spread about. Apart from this reason the casing might as well be dispensed with, as it does not serve for carrying any movable parts.

I claim l. In a grinding mill, the combination of a plurality of grinding rolls, a grinding ring surrounding said rolls and supported by one of them, means for rotating the supporting roll and thereby actuating the grinding ring, and a casing for the grinding devices adapted to be assembled and removed independent of any adjustment of said ring or rolls.

2. In a grinding mill, the combination. of a pair of parallel frames, a plurality of grinding rolls mounted in bearings in said frames, a grinding ring surrounding the rolls and supported by one of them, means for driving the said supporting roll to rotate the grinding ring and other rolls, and a casing adapted to be positioned about or removed from the grinding devices independent of any adjustment of the grinding ring, the rolls or supporting frames.

3. In a grinding mill, the combination of a pair of parallel frames, a plurality of. grinding rolls mounted in bearings 1n said frames, a grinding ring surrounding the rolls and supported by one of them, means for driving the said supporting roll to rotate the grinding ring and other rolls, and a sectional casing, inclosing the grinding devices, separable on a plane parallel to the axes of the rolls and adapted to be removed independently of any adjustment of the ring, rolls or said supporting fra-mes.

. 4. In a grinding mill, the combination of a suitable frame, an. upper grinding roll mounted in relatively stationary bearings on the frame, levers pivoted .on the frame below and at opposite sides of the bearings for said upper roll, two grinding rolls mounted in bearings' on said levers, a grinding ring surrounding all of the rolls and supported by the upper roll, means for revolving the ring, and. a casing inclosing the grinding devices and removable therefrom. without any adjustment of the ring, rolls or bearings for the latter. y

In testimony whereof I affix my signature in presence of two witnesses.

CURT GOLTDAMMER.

Witnesses:

ERNST KATZ, LoTTE LEWIN.

Copies ot this patent may be obtained for ve cents each, by addressing the Commissioner or Patents. Washington, I). G." 

